initial commit / add all books

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diff --git a/278/CH5/EX5.4/ex_5_4.sce b/278/CH5/EX5.4/ex_5_4.sce
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+//find exteranal diameter  of shaft

+clc

+//solution

+//given

+P=600*10^3//W//power

+N=110//rpm

+//Tmax=1.2 Tmean

+t=63//N/mm^2

+l=3000//mm

+q=0.024 //rad//angle of twist

+//k=di/do=3/8//ratio of inner adn outer diameter

+C=84*10^3//N/mm^2

+pi=3.14

+//P=2*pi*N*Tmean/60

+Tmean=60*P/(2*pi*N)//N-m

+Tmax=1.2*Tmean//N-m

+//Tmax*1000=(pi/16)*t*(do)^3(1-k^4)

+do=[{16*Tmax*1000/pi/t}/{1-(3/8)^4}]^0.33//mm

+//J=(pi/32)*{do1^4-di^4}

+//J=(pi/32)*(do1)^4*{1-(3/8)^4}=0.0962*do1^4

+//we know T/J=C*q/l

+do1={Tmax*1000*l/(C*q*0.0962)}^(1/4)//mm

+printf("the mean torque is ,%f N-m\n",Tmean)

+printf("the maximum torque is,%f N-m\n",Tmax)

+printf("the outer diameter using strength is,%f mm\n",do)

+printf("the outer diameter using stiffness is,%f mm",do1)